Martin manages to offend the local vicar who is due to conduct Martin and Louisa's wedding ceremony by suggesting he has a drinking problem. In a struggle over a bottle of whisky, the vicar stumbles and fractures his pelvis. As the ambulance takes the vicar to hospital, Martin is left with the dilemma of finding a replacement vicar with just three hours to go to the wedding. With less than an hour to go to the ceremony, pregnant bridesmaid Isobel goes into labor. Martin is summoned by Louisa, and on a windswept hill top above Portwenn he delivers a healthy baby boy. Now it's a race against time for Martin and Louisa to get to the church on time....